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python - tkinter - 致命 Python 错误：PyEval_RestoreThread：NULL tstate

问题描述

在我创建的 tkinter gui 中，如果在 tkinter 窗口中打开 matplotlib 绘图时尝试编写文本文件，则 python 会引发以下错误：

Fatal Python error: PyEval_RestoreThread: NULL tstate

Current thread 0x00002f58 (most recent call first):
  File "C:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5.py", line 164 in mainloop
  File "C:\ProgramData\Anaconda3\lib\site-packages\matplotlib\backend_bases.py", line 193 in __call__
  File "C:\ProgramData\Anaconda3\lib\site-packages\matplotlib\pyplot.py", line 253 in show
  File "C:\Users\rohit\python\connections.py", line 40 in draw_connected_pans
  File "tlscript.pyw", line 1325 in draw_all_pans
  File "C:\ProgramData\Anaconda3\lib\tkinter\__init__.py", line 1699 in __call__
  File "C:\ProgramData\Anaconda3\lib\tkinter\__init__.py", line 1277 in mainloop
  File "tlscript.pyw", line 1455 in <module>

如果我关闭包含绘图的 tkinter 窗口，然后执行用于写入文本文件的 gui 函数，则不会发生错误

用于创建 matplotlib 图的函数

在connections.py中包含第40行的函数，如上面的回溯

def draw_connected_pans(G):
    Pos = nx.spring_layout(G)
    nx.draw_networkx(G, pos = Pos)
    plt.axis('off')
    plt.show()

tlscript.py 中包含第 1325 行的函数，如上面的回溯

def draw_all_pans():
        try:
            application_window = window
            connections.draw_connected_pans(graph)
        except:
            exceptionhandler(traceback.format_exc())

触发错误的代码

connectionmenu2.add_command(label="Save as html plot of connected entities of pan ", command=save_connection_html)

@mydecorator
def save_connection_html():
    try:
        if graph:
            application_window = window
            pan = simpledialog.askstring('Prompt', 'Enter PAN', parent = application_window)
            connections.use_d3(graph,pan)
    except:
        exceptionhandler(traceback.format_exc())

def use_d3(H,pan):
    tree = return_json(H,pan)
    htmlx =htmls.htmlfile.replace('var flare','var flare = '+json.dumps(tree)+';')
    with open('connection_chart.html', 'w', encoding ='utf-8') as file:
        file.write(htmlx)

标签： pythontkinter

解决方案

我通过将参数 block=False 传递给 plt.show() 来解决它

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